Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investment in qualified affordable housing tax credits amortization	$ 1,800	$ 1,900	$ 3,625	$ 3,702
Affordable housing tax credit investments	56,722		56,722		$ 50,347
Affordable Housing Program Obligation	28,648		28,648		$ 22,282
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ 2,100	$ 2,200	$ 4,300	$ 4,900